Average Weather in Santiago Chile
In Santiago, the summers are warm, arid, and clear and the winters are cold and partly cloudy. Over the course of the year, the temperature typically varies from 38°F to 86°F and is rarely below 30°F or above 91°F.
Based on the tourism score, the best time of year to visit Santiago for warm-weather activities is from late November to mid March.
The hot season lasts for 4.0 months, from November 23 to March 22, with an average daily high temperature above 81°F. The hottest day of the year is January 16, with an average high of 86°F and low of 57°F.
The cool season lasts for 3.3 months, from May 20 to August 30, with an average daily high temperature below 65°F. The coldest day of the year is July 24, with an average low of 38°F and high of 60°F.
Average High and Low Temperature
The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.
Average Hourly Temperature
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
In Santiago, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.
The clearer part of the year in Santiago begins around October 18 and lasts for 6.0 months, ending around April 18. On January 31, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 91% of the time, and overcast or mostly cloudy 9% of the time.
The cloudier part of the year begins around April 18 and lasts for 6.0 months, ending around October 18. On May 31, the cloudiest day of the year, the sky is overcast or mostly cloudy 53% of the time, and clear, mostly clear, or partly cloudy 47% of the time.
Cloud Cover Categories
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Santiago varies throughout the year.
The wetter season lasts 4.2 months, from May 2 to September 7, with a greater than 11% chance of a given day being a wet day. The chance of a wet day peaks at 20% on June 26.
The drier season lasts 7.8 months, from September 7 to May 2. The smallest chance of a wet day is 2% on December 1.
Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 20% on June 26.
Daily Chance of Precipitation
To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Santiago experiences significant seasonal variation in monthly rainfall.
The rainy period of the year lasts for 5.6 months, from April 10 to September 30, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around June 12, with an average total accumulation of 2.4 inches.
The rainless period of the year lasts for 6.4 months, from September 30 to April 10. The least rain falls around December 13, with an average total accumulation of 0.1 inches.
Average Monthly Rainfall
The length of the day in Santiago varies significantly over the course of the year. In 2020, the shortest day is June 20, with 9 hours, 56 minutes of daylight; the longest day is December 21, with 14 hours, 23 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 6:25 AM on December 5, and the latest sunrise is 2 hours, 1 minute later at 8:26 AM on August 9. The earliest sunset is at 5:41 PM on June 11, and the latest sunset is 3 hours, 15 minutes later at 8:56 PM on January 7.
Daylight saving time (DST) is observed in Santiago during 2020, starting in the spring on August 9 and ending in the fall on May 9.
Sunrise & Sunset with Twilight and Daylight Saving Time
We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.
The perceived humidity level in Santiago, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, remaining a virtually constant 0% throughout.
Humidity Comfort Levels
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.
The average hourly wind speed in Santiago experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 4.4 months, from November 1 to March 13, with average wind speeds of more than 6.3 miles per hour. The windiest day of the year is January 4, with an average hourly wind speed of 7.1 miles per hour.
The calmer time of year lasts for 7.6 months, from March 13 to November 1. The calmest day of the year is May 8, with an average hourly wind speed of 5.5 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Santiago varies throughout the year.
The wind is most often from the east for 9.1 months, from February 16 to November 18, with a peak percentage of 63% on July 6. The wind is most often from the west for 2.9 months, from November 18 to February 16, with a peak percentage of 47% on January 1.
Santiago is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.
The average water temperature experiences some seasonal variation over the course of the year.
The time of year with warmer water lasts for 2.8 months, from January 2 to March 27, with an average temperature above 60°F. The day of the year with the warmest water is February 10, with an average temperature of 62°F.
The time of year with cooler water lasts for 4.5 months, from June 16 to October 31, with an average temperature below 56°F. The day of the year with the coolest water is August 5, with an average temperature of 54°F.
Average Water Temperature
Best Time of Year to Visit
To characterize how pleasant the weather is in Santiago throughout the year, we compute two travel scores.
The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Santiago for general outdoor tourist activities is from late November to mid March, with a peak score in the second week of January.
The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Santiago for hot-weather activities is from mid December to late February, with a peak score in the second week of January.
For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.
Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.
Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.
Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.
Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.
Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).
The growing season in Santiago typically lasts for 8.9 months (270 days), from around August 30 to around May 27, rarely starting before July 31 or after September 25, and rarely ending before May 4 or after June 24.
Time Spent in Various Temperature Bands and the Growing Season
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.
Based on growing degree days alone, the first spring blooms in Santiago should appear around August 4, only rarely appearing before July 29 or after August 17.
Growing Degree Days
This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.
The average daily incident shortwave solar energy experiences extreme seasonal variation over the course of the year.
The brighter period of the year lasts for 3.6 months, from November 2 to February 19, with an average daily incident shortwave energy per square meter above 8.1 kWh. The brightest day of the year is December 27, with an average of 9.5 kWh.
The darker period of the year lasts for 3.6 months, from April 30 to August 16, with an average daily incident shortwave energy per square meter below 4.1 kWh. The darkest day of the year is June 22, with an average of 2.7 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Santiago are -33.457 deg latitude, -70.648 deg longitude, and 1,811 ft elevation.
The topography within 2 miles of Santiago contains only modest variations in elevation, with a maximum elevation change of 285 feet and an average elevation above sea level of 1,818 feet. Within 10 miles contains only modest variations in elevation (6,207 feet). Within 50 miles also contains extreme variations in elevation (19,902 feet).
The area within 2 miles of Santiago is covered by artificial surfaces (71%), trees (13%), and grassland (11%), within 10 miles by artificial surfaces (34%) and shrubs (28%), and within 50 miles by shrubs (37%) and trees (20%).
This report illustrates the typical weather in Santiago, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
There are 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Santiago.
For each station, the records are corrected for the elevation difference between that station and Santiago according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
The estimated value at Santiago is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Santiago and a given station.
The stations contributing to this reconstruction are: Comodoro Arturo Merino Benítez International Airport (97%, 15 kilometers, northwest) and Curico (2.7%, 176 kilometers, south).
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus.
All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.
Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.
Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.
Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .
Time zones for aiports and weather stations are provided by AskGeo.com .
Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.
The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.
We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.
We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.